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btcec: check if recovered pk is at point of infinity

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Marius van der Wijden 2021-09-13 21:11:26 +02:00 • committed by Olaoluwa Osuntokun
parent 4f64fe9bd7
commit 744680237d
1 changed files with 4 additions and 0 deletions
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4
btcec/signature.go
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@ -353,6 +353,10 @@ func recoverKeyFromSignature(curve *KoblitzCurve, sig *Signature, msg []byte,
// step to prevent the jacobian conversion back and forth.
Qx, Qy := curve.Add(sRx, sRy, minuseGx, minuseGy)
if Qx.Sign() == 0 && Qy.Sign() == 0 {
return nil, errors.New("point (Qx, Qy) equals the point at infinity")
}
return &PublicKey{
Curve: curve,
X: Qx,